SyncPayResponse example

class AppSyncPaymentHandlerTest extends AbstractAppPaymentHandlerTestCase
{
    public function testPay(): void
    {
        $paymentMethodId = $this->getPaymentMethodId('syncTracked');
        $orderId = $this->createOrder($paymentMethodId);
        $transactionId = $this->createTransaction($orderId, $paymentMethodId);
        $salesChannelContext = $this->getSalesChannelContext($paymentMethodId);

        $response = new SyncPayResponse();
        $this->appendNewResponse($this->signResponse($response->jsonSerialize()));

        $data = new RequestDataBag(['foo' => 'bar']);
        $this->paymentService->handlePaymentByOrder($orderId, $data, $salesChannelContext);

        /** @var Request $request */
        $request = $this->getLastRequest();
        $body = $request->getBody()->getContents();

        $appSecret = $this->app->getAppSecret();
        static::assertNotNull($appSecret);